Hi Daniela as long as we're waiting for an answer from someone who knows what he/she is talking about, I don't think that a phone camera has a physical focal length (wouldn't know where it would fit...), but according to this https://www.dxomark.com/google-pixel3-camera-review/ yours has an equivalent of a 28mm focal length.
spikeyxxx Thank you. I had looked up the specs on line, but they didn't seem to translate. I appreciate the clarifying article!